Core barrel



June 3, 1930. J. G. BONE 1,761,292

CORE BARREL Filed Aug. 14, 1929 2 Sheets-Sheet 1 war .3 Z

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CORE BARREL Filed. Aug. 14, 1929 2 Sheets-Sheet 2 \NvEN-roR Jess?6.30m:-

- Patdiited June 3, 1 930 JOSEPH e. Bonn, or LONG BEACH, mama consBARREL Application filed August 14, 1929. Serial No. 385,838.

This invention relates to a core barrel particularly useful in obtainingcores during the drilling of an oil well.

The prime object of my invention is to provide a novel means forcompletely closing the lower end of the barrel as the barrel is liftedoff of the bottom of the hole, so that all of the core in the barrel isretained, and can not be lost while the tool is being removed.

' from the well. Another object isto provide a novel and efiectiveautomatic means for closing the lower end of the core barrel as the toolis lifted preparatory to removing the same from the well. 1

Other objects, advantages and features-of invention may appear from theaccompanying drawing, the subjoined detailed description and theappended claims.

In thedrawlng:

Figure 1 is -a side elevation of my barrel 7 with parts broken away toshow interior construction.

v Figure 2 is a sectional View taken on line 2-2 of Figure 1. Figure 3is a sectional View taken on line 3-3 ofFigure 1.

Flgure ids an enlarged fragmentary sectionalview of the lower partof thebarrel.

Figure 5 is a plan view of one of the closure segments.

Figure 6 is an end view of the same.

Figure 7 is a fragmentary longitudinal sectional view of the corebarrel. I

Figure8 is an enlarged fragmentary longitudinal sectional view-of thelower part of the core barrel. w

Figure 9 is a sectional Viewv taken on line 9--9 Figure 8.

Figure 10 is a sectional view taken on line 1010 Figure 8.

Figure 11 is a sectional view on the same line as Figure 10 with part ofthe closure segments broken away to show concealed structure.

Figure ,12 is a sectional view on the same line as Figure 10 and showingthe closure segments in open position.

Referring more particularlyto the draw-F .ing, the numeral 1 indicatesthe head of my 1 core barrel, which may consist of a plurality ofmembers, each screwed into the other a so as to form the completed head.,The purpose of the various pieces is to provide a means of assemblingthe core barrel. An 5 outerbarrel 2 screws into the-head 1 and dependstherefrom. A mandrel 3 extends into the head 1 and is slidably, butnonrot'atably held in the head by means of an,

elongated squared section 4 which fits into a squared opening 5. Asuitable coupling 6 such as a threaded pin is provided on the top of themandrel 3 whereby the mandrel is coupled to drill pipe or the like.

A packing nut 7 screws into the top of the head 1 and fits around themandrelt'o prevent the leakage of fluid downwardly past the mandrel. Ashoulder 8 is provided in the head 1 against which thesection 4 strikes,to limit the upward movement of the mandrel in the head, whereby theentire tool may be removed from the well by lifting upon the mandrel.The downward movement of the mandrel is limited in a similar manner bya; shoulder 9.in the lower end of the head.

An inner core retaining barrel 10 screws on to the lower end of themandrel 3, and said core retaining barrel extends downwardly through theouter barrel 2. A threaded pin 11 or the like is providedonthe lower endof so the barrel 2, or upon the cage-12 to receive the coring head. Thishead is of well known and usual constructionand forms no part ofthisinvention. g A cage 12 screws on to the lower end of the lower endthereof, which flange extends out- Y wardly into the cage 12. Thisflange serves to limit the longitudinal movement of the sleeve 13 for apurpose to be further described.

A plurality of cam slots 15 are cut through the sleeve ,13 and the innerbarrel 10 is provided with pins 16 which fit and extend into the slots15. It will be seen that when the mandrel 3 and inner barrel 10 areraised or lowered, the pins 16 moving in the cam slots 15 will cause thesleeve 13 to rotate. sleeve must rotate since the mandrel isnonrotatably held in the head. The rotation of the sleeve 13 will causethe bottom of said sleeve to be closed by the following means: Aplurality of arcuate closure segments 17 are pivotally secured to theflange 14 at one end thereof, and at the other end of each segment Iprovide a pin 18 which extends downwardly into a slot 19 in the bottomof the cage 12. Rotation of the sleeve 13 will cause all of the segmentsto move inwardly upon their pivots in the flange 14: as shownin Figure10. When the sleeve is rotated in the opposite direction, the segmentsare all moved into the position shown in Figure 12, thus leaving anon-restricted opening into the inner core retaining barrel.

The raising or lowering of the mandrel" 3 will open or close thesegments 17 so that the core barrel is free to receive the core duringthe drilling operations, but it is instantly closed to trap'the corewhen the mandrel is raised to remove the barrel from the well.

Having described my invention, I claim 1. A core barrel comprisin anouter barrel, an inner barrel within said outer barrel, means slidablymounting said inner barrel, pipe coupling means on the top of said innerbarrel, a sleeve rotatably mounted on said inner barrel, means couplingsaid sleeve and inner barrel whereby the sleeve is rotated as the innerbarrel is raised or lowered, and means on said sleeve adapted to extendacross the inner barrel when said inner barrel is raised. v

2. A core barrel comprising a head, an outer barrel depending from thehead,.a mandrel extending into the head, means slidably and'non-rotatably mounting the mandrel in the head, pipe coupling means onthe mandrel, an inner barrel dependin from the mandrel, said innerbarrel extending into the outer barrel, a sleeve slidably and rotatablymounted on the inner barrel, means coupllng said sleeve and inner barrelwhereby said sleeve is rotated as the inner barrel is ra sed or lowered,and means mounted on said sleeve extending across the inner barrel whensaid inner barrel is raised.

3. A core barrel comprisingv a head, an outer barrel depending from thehead, a mandrel extending into the head, means slidably andnon-rotatably mounting the mandrel 1n the head, pipe coupling means onthe This mandrel, an inner barrel depending from the mandrel, said innerbarrel extending into the outer barrel, a sleeve slidably and rotatablymounted on the inner barrel, means coupling said sleeve and inner barrelwhereby said sleeve is rotated as the inner barrel is raised or lowered,a plurality of arcuate closure segments pivotally mounted on said sleeveand means pivotally mounting one end of said segments to the outerbarrel.

1. A core barrel comprising a head, a mandrel extending into said head,a square section on said mandrel, said head having a square bore toreceive the section, an outer barrel depending from the head, an innerbarrel depending from the mandrel, a sleeve slidably and rotatablymounted on the inner barrel adjacent the lower end thereof, said sleevehaving cam slots formed therein, lugs on the inner barrel fitting intosaid cam slots whereby the sleeve is rotated when said inner barrel israised or lowered, and closure means on said sleeve extending acrosssaid inner barrel when the inner barrel is raised.

5. A core barrel comprising a head, a mandrel extending into said head,a square section on said mandrel, said head having a square bore toreceive the section, an outer barrel depending from the head, an innerbarrel depending from the mandrel, a sleeve slidably and rotatablymounted on the inner barrel adjacent the lower end thereof, said sleevehaving cam slots formed therein, lugs on the inner barrel fitting intosaid cam slots whereby the sleeve is rotated when said inner barrel israised or lowered, a plurality of arcuate closure segments pivotallymounted on said sleeve and means pivotally securing one end of saidsegments to the outer barrel.

.6. A core barrel comprising a head, a mandrel extending into said head,a square section on said mandrel, said head having a square bore toreceive the section, an outer barrel depending from the head, an innerbarrel depending from the mandrel, a sleeve slidably and rotatablymounted on the inner barrel adjacent the lower end thereof, said sleevehaving cam slots formed therein, lugs on the inner barrel fitting intosaid cam slots whereby the sleeve is rotated when said inner barrel israised or lowered, a cage secured to the lower end of the outer barrel,a flange on the sleeve extending into the cage whereby the longitudinalmovement of the sleeve is limited, a plurality of arcuate closuresegments pivotally secured to the flange, at one end thereof, and meanspivotally mounting the other end of said segments'to the cage.

7. A core barrel comprising a head, a mandrel extending into said head,a square section 011 said mandrel, said head having a square bore toreceive the section, an outer barrel depending from the head, an innerbarrel depending from the mandrel, a sleeve slidably and rotatablymounted on the inner barrel adjacent the lower end thereof, said sleevehaving cam slots formed therein, lugs onthe inner barrel fitting intosaid cam slots whereby the sleeve is rotated when said inner barrel israised or lowered, a cage secured to the lower end of the outer barrel,a flange on the sleeve extending into the cage whereby the longitudinalmovement of the sleeve is limited, a plurality of arcuate closure segments pivotally secured to the flange at one w end thereof, a pindepending from the free end of each of said segments, said cage havingslot-s formed therein into which said pins extend.

v In testimony whereof, I aflix my signature.

I JOSEPH G. BONE.

